On the Job Preferences dialog, you can define parameters for dimension lines.
Define dimension line parameters:
Dimensioning style - selected from the list of styles defined with the use of the mechanisms of the AutoCAD program (Note: a dimensioning style must always be selected)
Distance between lines (see the drawing below)
Minimum dimension - this is dimension specifying minimum value which is measured on the printout. The dimension is not shown if its size on the printout is smaller than given value (refers to the simple and group dimension line)
Auxiliary line offset - the offset value from a dimension line (the value A shown below) or from a dimensioned element (the value B shown below).